Dictionary

know–it–all

noun \ˈnō-ət-ˌl\

: a person who talks and behaves like someone who knows everything

Full Definition of KNOW-IT-ALL

:  one who claims to know everything; also :  one who disdains advice
know–it–all adjective

First Known Use of KNOW-IT-ALL

1895

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2 ENTRIES FOUND:
Next Word in the Dictionary: knowledgablePrevious Word in the Dictionary: knowing (adjective)All Words Near: know-it-all
May 28, 2015
fictioneer Hear it
someone who writes fiction
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